WO1994027270A1 - Hinged or rotating connection and method of manufacturing a hinged or rotating connection - Google Patents

Hinged or rotating connection and method of manufacturing a hinged or rotating connection Download PDF

Info

Publication number
WO1994027270A1
WO1994027270A1 PCT/NL1994/000111 NL9400111W WO9427270A1 WO 1994027270 A1 WO1994027270 A1 WO 1994027270A1 NL 9400111 W NL9400111 W NL 9400111W WO 9427270 A1 WO9427270 A1 WO 9427270A1
Authority
WO
WIPO (PCT)
Prior art keywords
hinged
rotating connection
inner part
elements
connection according
Prior art date
Application number
PCT/NL1994/000111
Other languages
French (fr)
Inventor
Nicolaas Petrus Dekker
Original Assignee
Alphenaar Stansen B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from NL9300853A external-priority patent/NL9300853A/en
Priority claimed from NL9301473A external-priority patent/NL9301473A/en
Application filed by Alphenaar Stansen B.V. filed Critical Alphenaar Stansen B.V.
Publication of WO1994027270A1 publication Critical patent/WO1994027270A1/en

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F11/00—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position
    • G09F11/23—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the advertising or display material forming part of rotating members, e.g. in the form of perforations, prints, or transparencies on a drum or disc
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F11/00—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position
    • G09F11/23—Indicating arrangements for variable information in which the complete information is permanently attached to a movable support which brings it to the display position the advertising or display material forming part of rotating members, e.g. in the form of perforations, prints, or transparencies on a drum or disc
    • G09F11/232—Disc card or folded disc shaped card information display devices

Definitions

  • Hinged or rotating connection and method of manufactu ⁇ ring a hinged or rotating connection a hinged or rotating connection.
  • the present invention relates to a hinged or rotating connection between elements closely placed on one another, more in particular of cardboard or pasteboard, with two outer elements and at least one inner element placed in between.
  • Such a hinged or rotating connection is applied for instance with respect to information slides, in which an information disc containing data is placed in be ⁇ tween two cover sheets, and which data may be perceived through windows in one or both of the cover sheets.
  • the hinged or rotating connection according to the invention is to that end characterized in that the inner element is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the inner part is glued to the outer elements.
  • a slit- shaped space is provided between the inner part and the outer part, while the space of movement of both parts to and from each other is limited by protuberances or projections present in the slit-shaped space and provi- ded on one of the edges of the parts.
  • the axis of the hinge is thus formed out of the material of an inner element, which is subsequently glued to the outer elements.
  • the hinge or rotation path of movement of the outer part around the inner part is limited by protuberances or projections provided on both of the edges of the parts.
  • one of the outer parts is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the size of the inner part of the outer element is greater than the size of the inner part of the inner element, and wherein both the inner parts are glued to one another and both the outer parts are glued to one another.
  • the invention further relates to a method of manufacturing the above-mentioned hinged or rotating connection, characterized in that a piece of planar material is provided with folding lines, by means of which the material is devided into three segments, and of which two segments are destined to form the outer elements and of which the third element is destined to form the inner element, while out of the inner element an inner part substantially completely is cut loose, at the same time forming a slit-shaped space between the inner part and the outer part, with the exception of protuberances or projections provided on one or both of the edges of the inner part or outer part, through which a limited connection exists between the inner part and the outer part, after which the inner element is folded over an outer element, and over which subsequently the second outer element is folded, and wherein the inner part of the inner element is glued to both the outer elements.
  • the outer part of the inner element is glued with one of its side planes to the inwardly directed plane of one of the outer elements, and after which out of the last-mentioned outer element an inner part is cut loose, the size of which is grea ⁇ ter than the size of the inner part of the inner ele- ment, while simultaneously the assembly of the three elements is cut loose from the piece of the planar material, so that the two glued outer parts on the one hand and the two glued inner parts and the other outer element on the other hand become freely rotatable with respect to each other.
  • the hinged or rotating connection may be manufactured using a sheet of planar material which is devided into pieces of planar material as described above, such that more than one hinged or rotating connection can be manufactured out of a sheet at the same time.
  • Fig. 1 is front view of an information slide, in which the invented rotating connection is applied.
  • Fig. 2 and Fig. 3 are cross sections along the lines A- A of fig. 1.
  • Fig. 4 is a front view of an inner element as applied in the rotating connection.
  • Fig. 5, 6, 7, 8 and 11 show different manufacturing steps for the manufacturing of a hinged or rotating connection according to claim 7.
  • Fig. 9 and 10 show views along the lines B-B respecti- vely C-C of Fig . 8 .
  • Fig. 12 and 13 show views of the completed hinged or rotating connection according to the lines D-D respec ⁇ tively E-E of Fig. 11.
  • Fig. 14 shows an embodiment of the hinged or rotating connection, in which a pop-up is applied.
  • the information slide is formed by two cover sheets 1 and 2, in between which a disc-shaped information disc 3 is locked.
  • the information disc 3 is formed by an inner part 4, and an outer part 5, that can hinge or rotate around the inner part 4.
  • the inner part 4 is cut loose from the outer part 5 of the inner element 3, while forming a slit-shaped space 6, with the exception of the projections or protuberances 7, such that after the manufacture of the information slide the existing connections in the inner element 3 between the inner part 4 and the outer part 5 may easily be broken by rotating the outer part 5.
  • the projections or protuberances 7 may be formed on both of the edges 8 and 9 of the parts 4 and 5, and by means of which the rotation path of movement, shown in the drawings by an arrow, of the outer part 5 with respect to the inner part 4, is limited.
  • the entirety of the cover sheets l and 2 and the information disc 3 is assembled, wherein the planes 10 and 11 of the inner part 4 are glued to the cover sheets 1 and 2.
  • text or information not shown in the drawing may be printed on the information disc 3, which may be perceived through windows (also not shown in the drawing) provided in a cover sheet.
  • FIG 5 a piece of planar material is shown, having two folding lines 12 and 13, and by means of which the piece is devided into a segment 1 , which is destined to form the inner element 3, and two segments 15 and 16, which are destined to form the outer elements l and 2.
  • the segment 16 is provided in a known manner with a window 17, while on the part of the segment 14, which is to form the inner element 3, the information may be printed.
  • an inner part 4 is simultaneously cut loose from an outer part 5 of the inner element 3, at the same time forming the slit-shaped space 6, with the exception of protube ⁇ rances or projections 7 along the edge 8, through which a limited connection remains between the inner part 4 and the outer part 5.
  • Fig. 6 shows a cross section of Fig. 5 along the line A-A.
  • the three elements 1, 2 and 3 are connected to each other along folding lines 12 and 13, and whereby in the centre of the outer element 2, and in the centre and out of the centre of the outer element 1, glue 18 is applied.
  • Fig. 7 the inner element 3 is folded over the outer element 1, whereby the inner part 4 and also the outer part 5 are glued to the outer element 1.
  • fig. 8 the outer element 2 is folded over the inner element 3, and whereby the inner part 4 of the inner element 3 at its other side is glued 8 to the outer element 2.
  • Fig. 9 shows a view of the accordingly obtained assem ⁇ bly along the line B-B of Fig. 8;
  • Fig. 10 shows a view along the line C-C.
  • Fig. 14 an embodiment is shown, in which in an outer element 2 a section 23 is provided, which is limited in the outer element by the cuts 24, 25 and 26 and the folding line 27, and which section 23 by means of the folding lines 28 and 29 is devided into three parts 30, 31 and 32.
  • the section 23 is partly with its inner plane glued to the thereto directed plane of the inner element 3.
  • the elements have been rota ⁇ ted with respect to each other, whereby the parts 30 and 31 of the section 23 are being folded towards each other, and the pop-up stands.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Toys (AREA)

Abstract

Hinged or rotating connection between elements closely placed on one another, more in particular of cardboard or pasteboard, with two outer elements (1, 2) and at least one inner element (3) placed in between, characterized in that the inner element (3) is formed by an inner part (4) and an outer part (5), wherein the outer part (5) can hinge or rotate around the inner part (4) and wherein the inner part (4) is glued to the outer elements (1, 2).

Description

Hinged or rotating connection and method of manufactu¬ ring a hinged or rotating connection.
The present invention relates to a hinged or rotating connection between elements closely placed on one another, more in particular of cardboard or pasteboard, with two outer elements and at least one inner element placed in between.
Such a hinged or rotating connection is applied for instance with respect to information slides, in which an information disc containing data is placed in be¬ tween two cover sheets, and which data may be perceived through windows in one or both of the cover sheets.
With this known hinged or rotating connection the connection between both the outer elements and the inner element is provided by means of a metal circular staple, which is led through openings provided in the elements, and of which the outer edges are subsequently collared. The application of the circular staple and the colla- ring of the outer edges to form a connection between the elements is a relatively long-winded and time- consuming job, causing this known hinged or rotating connection to be costly. The invention aims to obviate this drawback of the known hinged or rotating connection.
The hinged or rotating connection according to the invention is to that end characterized in that the inner element is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the inner part is glued to the outer elements.
According to a further characteristic of the hinged or rotating connection according to the invention, a slit- shaped space is provided between the inner part and the outer part, while the space of movement of both parts to and from each other is limited by protuberances or projections present in the slit-shaped space and provi- ded on one of the edges of the parts.
With the hinged or rotating connection according to the invention the axis of the hinge is thus formed out of the material of an inner element, which is subsequently glued to the outer elements. The slit-shaped space between the inner part and the outer part, wherein the space of movement of both parts to and from each other is limited by protuberances formed along one of the edges, leads to a minimal friction between the parts, so that the outer part may be rotated around the inner part in a very smooth and easy manner.
According to a further characteristic of the hinged or rotating connection according to the invention, the hinge or rotation path of movement of the outer part around the inner part is limited by protuberances or projections provided on both of the edges of the parts. With this measure it is achieved, that the outer part cannot be rotated around the inner part complete¬ ly, but only along a limited distance. This is effi- cient in case a so-called pop-up is applied in the hinged or rotating connection, so that the risk of damaging, such as tearing, of the pop-up, due to pul¬ ling too hard, is prevented.
According to a further characteristic of the hinged or rotating connection according to the invention, one of the outer parts is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the size of the inner part of the outer element is greater than the size of the inner part of the inner element, and wherein both the inner parts are glued to one another and both the outer parts are glued to one another.
The invention further relates to a method of manufacturing the above-mentioned hinged or rotating connection, characterized in that a piece of planar material is provided with folding lines, by means of which the material is devided into three segments, and of which two segments are destined to form the outer elements and of which the third element is destined to form the inner element, while out of the inner element an inner part substantially completely is cut loose, at the same time forming a slit-shaped space between the inner part and the outer part, with the exception of protuberances or projections provided on one or both of the edges of the inner part or outer part, through which a limited connection exists between the inner part and the outer part, after which the inner element is folded over an outer element, and over which subsequently the second outer element is folded, and wherein the inner part of the inner element is glued to both the outer elements.
According to a further characteristic of the method according to the invention, the outer part of the inner element is glued with one of its side planes to the inwardly directed plane of one of the outer elements, and after which out of the last-mentioned outer element an inner part is cut loose, the size of which is grea¬ ter than the size of the inner part of the inner ele- ment, while simultaneously the assembly of the three elements is cut loose from the piece of the planar material, so that the two glued outer parts on the one hand and the two glued inner parts and the other outer element on the other hand become freely rotatable with respect to each other. Thus it is possible to carry out the manufacture of the connection completely automatically, mechanically and in one operational step, by means of which a very inexpensive and moreover aesthetical connection between the elements is provided.
By simultaneously, that is to say, in one operational step, cutting loose the inner part from the outer element and the assembly of the elements from the piece of planar material, it is achieved in a very simple manner, that the inner part of the outer element and the assembly of the elements have the same centre.
In an efficient manner the hinged or rotating connection may be manufactured using a sheet of planar material which is devided into pieces of planar material as described above, such that more than one hinged or rotating connection can be manufactured out of a sheet at the same time.
Other characteristics and particulars will be described with reference to the drawing of an example of an embodiment.
Fig. 1 is front view of an information slide, in which the invented rotating connection is applied.
Fig. 2 and Fig. 3 are cross sections along the lines A- A of fig. 1.
Fig. 4 is a front view of an inner element as applied in the rotating connection.
Fig. 5, 6, 7, 8 and 11 show different manufacturing steps for the manufacturing of a hinged or rotating connection according to claim 7.
Fig. 9 and 10 show views along the lines B-B respecti- vely C-C of Fig . 8 .
Fig. 12 and 13 show views of the completed hinged or rotating connection according to the lines D-D respec¬ tively E-E of Fig. 11.
Fig. 14 shows an embodiment of the hinged or rotating connection, in which a pop-up is applied.
As is shown in Fig. 1, 2 and 3, the information slide is formed by two cover sheets 1 and 2, in between which a disc-shaped information disc 3 is locked. The information disc 3 is formed by an inner part 4, and an outer part 5, that can hinge or rotate around the inner part 4.
As is shown in Fig. 1 to 4, the inner part 4 is cut loose from the outer part 5 of the inner element 3, while forming a slit-shaped space 6, with the exception of the projections or protuberances 7, such that after the manufacture of the information slide the existing connections in the inner element 3 between the inner part 4 and the outer part 5 may easily be broken by rotating the outer part 5.
As is shown in Fig. 4, the projections or protuberances 7 may be formed on both of the edges 8 and 9 of the parts 4 and 5, and by means of which the rotation path of movement, shown in the drawings by an arrow, of the outer part 5 with respect to the inner part 4, is limited.
As is shown in Fig. 3, the entirety of the cover sheets l and 2 and the information disc 3 is assembled, wherein the planes 10 and 11 of the inner part 4 are glued to the cover sheets 1 and 2. As is generally known, text or information not shown in the drawing may be printed on the information disc 3, which may be perceived through windows (also not shown in the drawing) provided in a cover sheet.
In figure 5 a piece of planar material is shown, having two folding lines 12 and 13, and by means of which the piece is devided into a segment 1 , which is destined to form the inner element 3, and two segments 15 and 16, which are destined to form the outer elements l and 2. The segment 16 is provided in a known manner with a window 17, while on the part of the segment 14, which is to form the inner element 3, the information may be printed. When cutting the window 17 in the segment 16, an inner part 4 is simultaneously cut loose from an outer part 5 of the inner element 3, at the same time forming the slit-shaped space 6, with the exception of protube¬ rances or projections 7 along the edge 8, through which a limited connection remains between the inner part 4 and the outer part 5.
Fig. 6 shows a cross section of Fig. 5 along the line A-A. As is shown in Fig. 6, the three elements 1, 2 and 3 are connected to each other along folding lines 12 and 13, and whereby in the centre of the outer element 2, and in the centre and out of the centre of the outer element 1, glue 18 is applied.
In Fig. 7 the inner element 3 is folded over the outer element 1, whereby the inner part 4 and also the outer part 5 are glued to the outer element 1. In fig. 8 the outer element 2 is folded over the inner element 3, and whereby the inner part 4 of the inner element 3 at its other side is glued 8 to the outer element 2. Fig. 9 shows a view of the accordingly obtained assem¬ bly along the line B-B of Fig. 8; Fig. 10 shows a view along the line C-C.
As is shown in Fig. 11, out of the outer element 1 according to the lines 19 an inner part 20 is cut loose from an outer part 21, while simultaneously along the lines 22 the assembly of the elements l, 2 and 3 is cut loose from the piece of planar material, and whereby the two glued outer parts 5 and 21 on the one hand and the two glued inner parts 4 and 20 and the outer element 2 on the other hand become freely rotatable with respect to each other.
In Fig. 14 an embodiment is shown, in which in an outer element 2 a section 23 is provided, which is limited in the outer element by the cuts 24, 25 and 26 and the folding line 27, and which section 23 by means of the folding lines 28 and 29 is devided into three parts 30, 31 and 32. At the part 32 the section 23 is partly with its inner plane glued to the thereto directed plane of the inner element 3. In the drawing the elements have been rota¬ ted with respect to each other, whereby the parts 30 and 31 of the section 23 are being folded towards each other, and the pop-up stands.

Claims

C l a i m s
1. Hinged or rotating connection between elements closely placed on one another, more in particular of cardboard or pasteboard, with two outer elements and at least one inner element placed in between, characterized in that the inner element is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the inner part is glued to the outer elements.
2. Hinged or rotating connection according to claim l, characterized in that both of the outer elements have the shape of cover sheets which, except for windows provided in the cover sheets, cover the disc-shaped inner element.
3. Hinged or rotating connection according to claim 1, characterized in that one of the outer elements has the shape of a cover sheet and the other outer element has the shape of a disc-shaped securing part the size of which is smaller than that of the disc-shaped inner element, but greater than that of the inner part there¬ of.
4. Hinged or rotating connection according to claim 1, characterized in that between the inner part and the outer part a slit-shaped space is provided, while the space of movement of both parts to and from each other is limited by protuberances or projections present in the slit-shaped space and provided on one of the edges of the parts.
5. Hinged or rotating connection according to claim 4, characterized in that the hinge or rotation path of movement of the outer part around the inner part is limited by protuberances or projections provided on both of the edges of the parts.
6. Hinged or rotating connection according to claim 4 or 5, characterized in that the inner part is cut loose from the outer part of the inner element, with the exception of the protuberances or projections, through which a limited connection exists between the inner part and the outer part.
7. Hinged or rotating connection according to claim 1, 4, 5 or 6, characterized in that one of the outer parts is formed by an inner part and an outer part, wherein the outer part can hinge or rotate around the inner part, and wherein the size of the inner part of the outer element is greater than the size of the inner part of the inner element, and wherein both the inner parts are glued to one another and both the outer parts are glued to one another.
8. Method of manufacturing a hinged or rotating connec¬ tion according to claim 4, 5 or 6, characterized in that a piece of planar material is provided with fol- ding lines, by means of which the material is devided into three segments, and of which two segments are destined to form the outer elements and of which the third element is destined to form the inner element, while out of the inner element an inner part substanti- ally completely is cut loose, after which the inner element is folded over an outer element, and over which subsequently the second outer element is folded, and wherein the inner part of the inner element is glued to the outer elements.
9. Method of manufacturing a hinged or rotating connection according to claim 8, characterized in that the outer part of the inner element is glued with one of its side planes to the inwardly directed plane of one of the outer elements, and after which out of the last-mentioned outer element an inner part is cut loose, the size of which is greater than the size of the inner part of the inner element, while si ulta- neously the assembly of the three elements is cut loose from the piece of the planar material, so that the two glued outer parts on the one hand and the two glued inner parts and the other outer element on the other hand become freely rotatable with respect to each other.
10. Method of manufacturing a hinged or rotating connection according to claim 8 or 9, characterized in that the inner part is cut loose from the inner element while forming a slit-shaped space between the inner part and the outer part, with the exception of projec¬ tions or protuberances provided along one or both of the edge s of the outer part or inner part.
11. Method of manufacturing a hinged or rotating connection according to claim 8, 9 or 10, characterized in that a sheet of planar material is devided into pieces of planar material as described in these claims, such that more than one hinged or rotating connection can be manufactured out of a sheet at the same time.
12. Hinged or rotating connection according to one of the preceding claims, characterized in that the ele¬ ments have the same size.
13. Hinged or rotating connection according to one of the preceding claims, characterized in that one or more of the elements are provided with windows.
14. Hinged or rotating connection according to one of the preceding claims, characterized in that in an outer element a section is provided, which is limited in the element by one or more cuts or slits and one or more folding lines, and which section by means of one or more folding lines is devided into three or more parts, and wherein a part of the section with its inwardly directed plane is glued to the plane of another element, more in particular the inner element, so that, when the two elements are rotated with res¬ pect to each other in a certain direction, the planes of the parts of the section are folded to each other, such that the section stand up with respect to ele¬ ments.
PCT/NL1994/000111 1993-05-17 1994-05-17 Hinged or rotating connection and method of manufacturing a hinged or rotating connection WO1994027270A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL9300853 1993-05-17
NL9300853A NL9300853A (en) 1993-05-17 1993-05-17 Hinged or rotary connection
NL9301473A NL9301473A (en) 1993-08-25 1993-08-25 Hinged or pivot joint, and method for fabricating a hinged or pivot joint
NL9301473 1993-08-25

Publications (1)

Publication Number Publication Date
WO1994027270A1 true WO1994027270A1 (en) 1994-11-24

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PCT/NL1994/000111 WO1994027270A1 (en) 1993-05-17 1994-05-17 Hinged or rotating connection and method of manufacturing a hinged or rotating connection

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000511A1 (en) * 1995-06-17 1997-01-03 Baumann Guenter Disc-shaped member
WO2009127792A1 (en) * 2008-04-18 2009-10-22 Yan Van Ruymbeke Device for selective display of information
DE102012104153A1 (en) * 2012-05-11 2013-11-14 Harald Klinghammer Display device and method for producing such

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604134A (en) * 1969-01-30 1971-09-14 Charles F Clark Pivots for rotary surfaces
US3718519A (en) * 1971-07-21 1973-02-27 D Montgomery Method of making flat rotatable disc assemblies
US3820263A (en) * 1969-01-30 1974-06-28 C Clark Dials and methods of making them
US3939586A (en) * 1971-06-07 1976-02-24 Clark Charles F Relatively movable bodies and methods of making them
FR2293020A1 (en) * 1974-11-27 1976-06-25 Le Texier Rene Device for selective presentation of data - has card folded over part movable to expose data through card opening
EP0142892A1 (en) * 1983-11-16 1985-05-29 Gerrit Alphenaar Method for manufacturing an information slide or information disc

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3604134A (en) * 1969-01-30 1971-09-14 Charles F Clark Pivots for rotary surfaces
US3820263A (en) * 1969-01-30 1974-06-28 C Clark Dials and methods of making them
US3939586A (en) * 1971-06-07 1976-02-24 Clark Charles F Relatively movable bodies and methods of making them
US3718519A (en) * 1971-07-21 1973-02-27 D Montgomery Method of making flat rotatable disc assemblies
FR2293020A1 (en) * 1974-11-27 1976-06-25 Le Texier Rene Device for selective presentation of data - has card folded over part movable to expose data through card opening
EP0142892A1 (en) * 1983-11-16 1985-05-29 Gerrit Alphenaar Method for manufacturing an information slide or information disc

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997000511A1 (en) * 1995-06-17 1997-01-03 Baumann Guenter Disc-shaped member
WO2009127792A1 (en) * 2008-04-18 2009-10-22 Yan Van Ruymbeke Device for selective display of information
DE102012104153A1 (en) * 2012-05-11 2013-11-14 Harald Klinghammer Display device and method for producing such
DE102012104153B4 (en) * 2012-05-11 2014-05-15 Harald Klinghammer Display device and method for producing such
EP2662849A3 (en) * 2012-05-11 2014-09-24 Harald Klinghammer Display device and method for manufacturing the same

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